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PRACTICAL ORGANIC CHEMISTRY

as before, and heated with a little animal charcoal (5  10 grams)
for half hour and then filtered.    Yield, 30  35 grams.

Properties. Rhombic plates ; m.p. 112 ; b.p. 295.

Reaction.  Introduce about 0*5 gram of the substance into a
test-tube, and* add 3 c.c. concentrated hydrochloric acid. T3oil
for a minute. On diluting with water, a clear solution is ob-
tained.

See Appendix, p. 278.

PREPARATION   55.
p-Bromacetanilide, C0H4

\---                T

Remitters, Ber., 1874, 7, 346.

5  grms. acetanilide.

25 c.c. glacial acetic acid.

6 grms. bromine.                                       ^

Dissolve the acetanilide in the acetic acid in a flask (-| litre),
and add gradually the bromine, dissolved in about twice its
volume of glacial acetic acid, and shake well. When tlie
bromine has been added, let the mixture stand \ hour rind
then pour into 200 c.c. water and rinse out with water.
Filter the crystalline precipitate at the pump and wash three or
four times with water. Press it well down and let it clrnin.
Dissolve the moist substance in spirit (about 60 c.c.) ;mcl
pour into a beaker to crystallise. Filter the crystals, wjtsh
with a little dilute spirit, and dry on filter paper. Yield 6  7
grams.

C0H6NH.C2H3O + Br2 = C6H4Br.NH.C2H;5O4-HBr

Properties.-^Colourless needles; m.p. 165  166. On liy-
drolysis with concentrated hydrochloric acid, /-bromaniline is
formed (see above reaction for acetanilide).